Las Vegas has been revealed as Osama Bin Laden's number one terror target.

Al Qaeda terrorists posing as tourists compiled a detailed dossier on America's gambling mecca, according to a top secret intelligence report. Videos and photographs of a string of landmarks and major hotels were sent back to terror bosses plotting a spectacular sequel to the September 11 attacks.

The security report - marked "restricted" and circulated to U.S. and coalition intelligence agencies - was drawn up by British intelligence agents following the arrest of 21 Al Qaeda operatives. It says: "Based on intelligence, Las Vegas is seen as the prime target for a major impact attack."

It explains later: "It would be the mainland 'spectacular' that we have been hearing about for some time.

"Information indicates that any attack would be multi-centered at several sites and probably take the form of explosive devices.

"Las Vegas represents all that is wrong about the West and so symbolically represents, to them, the ideal choice of target. This elevates it to being probably the most likely target in our assessment based on what we have learned recently."